A bit more info here might be useful..
1: Can you explain the TiVo "freezing and black screen"? Is this happening with live TV broadcasts? Or, say, OnDemand? Is it a black flicker or a permanent black screen?
2: "Told an engineer would come" - was this by calling faults to report the problem? Were you given an appointment timeslot?
3: On the assumption you had an appointment slot, did you receive any comms from VM regarding cancellation?
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